Ext ©introduction to biology: mastery testhow is a scientific law different from a scientific theory? oa. a theory becomes a law after a long period of time has passed. ob. a theory is used for biology and chemistry and a law is used for physics. heegesuc. a theory is why something happens and a law is how something happens. coislandsabod. a theory cannot be disproved but a law can be disproved. nites